package cc.openhome;
import java.util.Scanner;
public class Average4{
    public static void main(String[] args) {
        double sum=0;
        int count=0;
        while (true){
            int number= nextInt();
            if (number==0){
                break;
            }
            sum+=number;
            count++;


        }
        System.out.printf("平均%.2f%n",sum/count);

    }
    static Scanner console=new Scanner(System.in);
    static int nextInt(){
        String input =console.next();
        while (!input.matches("\\d*")){
            System.out.println("请输入数字");
            input=console.next();

        }
        return Integer.parseInt(input);
    }
}
